最新河北省中考数学试题答案优秀名师资料.doc
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1、2012年河北省中考数学试题答案2012年河北省初中毕业生升学文化课考试 数学试题参考答案 一、选择题(16小题,每小题2分;712小题,每小题3发,共30分) 题号 1 2 3 4 5 6 7 8 9 10 11 12 答案 B C A C D B D A B C A D 二、填空题(每小题3分,满分18分) 313(5 14(52 15(1 16( 17(21 18(6 4三、解答题(本大题共8小题,共72分) 11,0219(解: ,,,,,5(23)6(1),32,= ? 5分 51(23)1,,,,=4( ? 8分 ABx,10ADx,5CDx,220(解:(1)设km,则km,km
2、( ABCDDCAB?四边形是等腰梯形, ?,BCADx5. ?,,ADDCCBx12. 12x:10=6:5x外环公路总长和市区公路长的比为. ? 3分 ?10x12x(2)由(1)可知,市区公路物长为km,外环公路的总长为km( 10121xx,,由题意,得. ? 6分 408010x,1解这个方程,得. ?,1010x. 答:市区公路的长为10km. ? 8分 21(解:(1)4,6?2分 (2)如图1 ? 3分 (3)?乙 ? 4分 accident and the responsibility of leadership, such as concerning administrat
3、ive sanctions should be dealt with by the personnel Department of the company. (3) personal injury accident occurs, the direct punishment 500-1000, who is directly responsible for the accident responsibility, give notice of criticism and 50-100 economic sanctions against them. (4) to conceal the acc
4、ident, reported without undue delay or false, to inform the administrative leadership of the criticism, resulting in serious consequences, the pursuit of leadership, along with 500-1000 punishment. (5) significant near miss should be attempted as the case of responsible for the accident and construc
5、tion team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion welded butt joints, welding engineering-Ray lighting and quality rating of 2 GB11345-89 steel welds manual methods of u
6、ltrasonic inspection and testing results for grade 3 GB50236-2002 industrial pipe welding engineering code for construction and acceptance of field equipment 4 HGJ222-92 technical specification for welding of aluminium and its alloys 5 low temperature steel welding procedure 6 SH3525-2004 petrochemi
7、cal JB/ T4708-2000 of welding procedure qualification for steel pressure vessels 7 JB/4709-2000 8 JB4730-2005 pressure vessel welding procedures of steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installatio
8、n engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance
9、 specification for 5 GB50275-98 compressor, fan 1222222=1.6.? 5分 S,,,,,,,,,(76)(56)(76)(46)(76)乙522由于,所以上述判断正确. ? 6分 SS,乙甲?因为两人成绩的平均水平(平均数)相同,乙的成绩比甲稳定,所以乙将被选中.? 8分 ADBC,222(解:(1)由题意,故点的坐标为(1,2).? 2分 Dm反比例函数的图象经过点, D(12),?xm?,?,2.2.m 12反比例函数的解析式为y,.? 4分 ?xx,3(2)当时, ykk,,,3333.C一次函数的图象一定过点( ? 6分 ykxkk
10、,,,33(0)?2(3)设点P的横坐标为aa,,3. ? 8分 3(注:对(3)中的取值范围,其他正确写法,均相应给分) AEEDAEED,,23(解:(1)( ? 2分 ,?,BCABBEECDC,90.(2)?证明:由题意, ??与?EGFEAB1:2位似且相似比是, 11,?, ?,GFEBGFABEFEB90.22?,?GFEC. 1?EHHCEC,, 2111?,,,,,GFHCFHFEEHEBECBCECCD,. 222??HGFDHC. ? 5分 ?,GHHDGHFHDC,?. ,??,?HDCDHCGHFDHC,,?,,9090又. ,??GHD=90. ?,GHHD.? 7
11、分 CHk?的长为. ? 9分 kxyxn24(解:(1)设一张薄板的边长为cm,它的出厂价为元,基础价为元,浮动价为ykxn,,元,则. ? 2分 accident and the responsibility of leadership, such as concerning administrative sanctions should be dealt with by the personnel Department of the company. (3) personal injury accident occurs, the direct punishment 500-1000,
12、who is directly responsible for the accident responsibility, give notice of criticism and 50-100 economic sanctions against them. (4) to conceal the accident, reported without undue delay or false, to inform the administrative leadership of the criticism, resulting in serious consequences, the pursu
13、it of leadership, along with 500-1000 punishment. (5) significant near miss should be attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial num
14、ber a 1 GB3323-2005 steel fusion welded butt joints, welding engineering-Ray lighting and quality rating of 2 GB11345-89 steel welds manual methods of ultrasonic inspection and testing results for grade 3 GB50236-2002 industrial pipe welding engineering code for construction and acceptance of field
15、equipment 4 HGJ222-92 technical specification for welding of aluminium and its alloys 5 low temperature steel welding procedure 6 SH3525-2004 petrochemical JB/ T4708-2000 of welding procedure qualification for steel pressure vessels 7 JB/4709-2000 8 JB4730-2005 pressure vessel welding procedures of
16、steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil
17、 tank 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan 5020,,kn,k,2,,由表格中的数据,得 解得 ,7030.,,knn,10.,所以 ? 4分 yx,,210.2(2)?设一张薄板的利润为元,它的成本价为元,由题意,得 Pmx22? 5分 P
18、ymxxmx,,,210.22xP,4026,将代入中,得. Pxmx,,,210262401040,,,,m1解得 m,.2512所以? 7分 Pxx,,210.251b2?因为a,0,所以,当(在550之间)时, x,251252a,2,,25,1,24102,,,,24acb,25, P,35.最大值14a,4,,25,即出厂一张边长为25cm的薄板,获得的利润最大,最大利润是35元. ? 9分 (注:边长的取值范围不作为扣分点) ,??BCOCBO,4525(解:(1), ?,OCOB3. Cy又点在轴的正半轴上, ?C点的坐标为(0,3) ? 2分 ?PB(2)当点在点右侧时,如图2
19、. ,?BCP,15?PCO,30若,得. accident and the responsibility of leadership, such as concerning administrative sanctions should be dealt with by the personnel Department of the company. (3) personal injury accident occurs, the direct punishment 500-1000, who is directly responsible for the accident responsi
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